“Waste-derived fuel” means a fuel typically derived from waste(s) and generally used as a substitute for conventional fossil fuels. Waste-derived fuels can include fossil fuels such as waste oil, plastics, or solvents; biomass such as dried sewage or impregnated saw dust; or fractions of both fossil fuels and biomass such as municipal solid waste or tires.

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“Wastewater” means any process water which contains oil, emulsified oil, or other organic compounds that are not recycled or otherwise used in a facility.

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“Wastewater separator” means equipment used to separate oils and water from locations downstream of process drains.